<template>
  <el-container class="home-container">
    <!--    头部区域-->
    <el-header>
      <div class="header">
        <img src="~assets/logo.png" alt="" />
        <span>后台管理系统</span>
      </div>
      <el-button plain @click="logout">退出</el-button>
    </el-header>
    <!--页面主题部分-->
    <el-container>
      <!--侧边栏-->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!--侧边栏菜单区域-->
        <el-menu
          background-color="#666666"
          text-color="#fff"
          active-text-color="#fcaf17"
          :unique-opened="true"
          :collapse="isCollapse"
          :collapse-transition="false"
          :router="true"
          :default-active="activePath"
        >
          <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
            <!--一级菜单的模板区-->
            <template slot="title">
              <!-- 图标-->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本-->
              <span>{{ item.authName }}</span>
            </template>
            <!--二级菜单-->
            <el-menu-item
              :index="'/' + subItems.path"
              v-for="subItems in item.children"
              :key="subItems.id"
              @click="saveNavState('/' + subItems.path)"
            >
              <!--二级菜单的模板区-->
              <template slot="title">
                <!--图标-->
                <i class="el-icon-menu"></i>
                <!--文本-->
                <span>{{ subItems.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!--主体部分-->
      <el-main>
        <!--路由占位符-->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: 'Home',
  data() {
    return {
      // 左侧菜单数据
      menuList: [],
      iconsObj: {
        '125': 'iconfont icon-yonghu1',
        '103': 'iconfont icon-tijikongjian-xianxing',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju-tianchong',
        '145': 'iconfont icon-baobiao1'
      },
      // 是否折叠
      isCollapse: false,
      // 保存被激活的链接地址
      activePath: ''
    }
  },
  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  }
}
</script>

<style scoped lang="less">
.home-container {
  height: 100%;
}
.el-header {
  background-color: #9d9087;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #ffffff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
    img {
      width: 45px;
      height: 45px;
    }
  }
}
.el-aside {
  background-color: #666666;
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background-color: #f2eada;
}
.iconfont {
  margin-right: 10px;
  color: #eeeeee;
}
.el-icon-menu {
  color: #eeeeee;
}
.toggle-button {
  background-color: #a1a3a6;
  font-size: 10px;
  line-height: 24px;
  color: #ffffff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
